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https://issues.apache.org/jira/browse/CALCITE-7480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18074818#comment-18074818
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Sergey Nuyanzin commented on CALCITE-7480:
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Thank you for the review [~mbudiu]
> Unparse of MATCH_RECOGNIZE with PARTITION BY or ORDER BY produces invalid SQL
> -----------------------------------------------------------------------------
>
> Key: CALCITE-7480
> URL: https://issues.apache.org/jira/browse/CALCITE-7480
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Sergey Nuyanzin
> Assignee: Sergey Nuyanzin
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.42.0
>
>
> Example of SQL
> {code:sql}
> SELECT *
> FROM (SELECT empno, deptno from sales.emp)
> MATCH_RECOGNIZE (
> PARTITION BY empno
> ORDER BY deptno
> MEASURES
> FINAL COUNT(A.deptno) AS deptno
> PATTERN (A B)
> DEFINE
> A AS A.empno = 123
> )
> {code}
> currently it is being unparsed as
> {code:sql}
> SELECT `T`.`EMPNO`, `T`.`DEPTNO`
> FROM `CATALOG`.`SALES`.`EMP` AS `EMP_ALIAS` MATCH_RECOGNIZE(
> PARTITION BY `*`.`EMPNO`
> ORDER BY `*`.`DEPTNO`
> MEASURES FINAL COUNT(`A`.`DEPTNO`) AS `DEPTNO`
> PATTERN (`A` `B`)
> DEFINE `A` AS PREV(`A`.`EMPNO`, 0) = 123) AS `T`
> {code}
> The most problem part is
> {code}
> PARTITION BY `*`.`EMPNO`
> ORDER BY `*`.`DEPTNO`
> {code}
> which is not parsable anymore
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